Grinding-mill



(N0 Model.)

J. T. OBBNOHAIN.

GRINDING MILL.

Pg tented Feb. 7.1882. .2

N. PETERS. Phomuwn n m. Walhingiou. D c.

* UNITED STATES PATENT OFFICE.

JOHN T. ()BENOHAIN, OF LOGANSPORT, INDIANA.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 253,415, datedFebruary'7, 1882.

' Application filed August 19, 1880. (No model.)

To all whom it may concern:

Be it known that I, JOHN T. OBENGHAIN, a citizen of the United States,residing at Logansport, in the county of Cass and State of Indiana, haveinvented certain new and useful Improvements in Grinding-Mills, of whichthe'following is a specification.

My invention relates to an improvement in grinding-mills.

The invention consists in the combination of a millstone and an annularring in which it is arranged with an outer concentric ringarranged tocreate an annular space between the two rings for receiving weights, andpartitions arranged in said annular ring to prevent the weights fromshiftin gdurin g the rotation of the stone. 7

The invention consists, also, in a novel combination, with themillstone-spindle, of a trampot, a ring, pivots supporting the tram-pot,pivots on which the ring is suspended, and a bridge-tree supporting thepivots of the ring, all as more fully hereinafter described in detail.

The invention also consists in a novel combination of a journal-bearing,a ring, adjustable pivots supported by the ring, and on which thejournal-bearing is suspended, lugs secured to the main frame, and pivotspassing through the lugs and sustaining the said ring.

The invention also consists in the combination, with the lower spindleof a two-part millspindle, of afeed-saucer detachably connected with theupper end of the lower spindle at a point below the face and within thebody of the lower running-stone.

The invention also consistsin abalanced pivoted pressure-plate and leverarranged upon the hopper, with afloat or plate portion adapted to beheld down or kept from rising by the weight of the material or charge inthe hopper, in combination with a swinging bridge tree and devicesadapted, by connection with the pressure-plate lever, to raise thebridge, and to admit, after their disconnection from said lever, of theshifting of the bridge so as to re move the grindingpressure from themillstones.

The invention also consists in a pressureplate and lever, in combinationwith tripping devices arranged to automatically remove thegrindingpressure from the millstone, as the charge of grist leaves thehopper, by shifting the bridge and the running-stone.

Other features of the invention will be hereinafter described, andspecifically set forth in the claims.

Figure lisa vertical elevatiompartl y broken and in section, showingmyimproved mill with its parts in position for grinding. Fig. 2 is avertical elevation, showing the mill with its parts in position when thestones are at rest. Fig. 3 is a vertical crosssection on line as as,Fig. 2, but showing a difierent preferred form of feed or drop tubeadjustment, and omitting the gravitating-lever and its accessories. Fig.4. is a plan or top view of the lower millstone and the bands or ringsencompassing it, but having sufficient space between them for theintroduction and adjustment of balancingweights. Fig. 5 is a plan or topview of the upper stone and its immediate connecting and supportingparts and the preferred form of feed-tube adjustments. Fig. 6 is avertical sectional elevation of a portion of an upperrunning mill,showing the manner of applying my improved automatic devices for raisingthe upper stone to throw it out of grinding-conned.

tion with the lower stone.

A A represent the frame of the mill; A, the curb for the lower orrunning stone.

B represents a swinging bridge-tree; B, an adjustable rod by which thebridge-tree is suspended and adjusted.

0 represents the spindle on which the stone runs.

0 represents a disk attached to the shaft 0 by means of a hub, P. On theperiphery of this disk is a flange or ring, 0'.

- 0 represents a secondary ring concentric with the inner ring, 0, andattached to it in any suitable manner, but leaving between these tworings an annular space, a, into which weights are placed at suitablepoints to balance the running of the stone.

0 represents divisions of the annular space a, so as to hold the weightsin proper position to balance the stone.

D represents the under or running stone, securely attached to the insideof the ring 0.

d represents the eye of the stone D, which is much larger than thespindle G, and it is IOC filled with plaster-of-paris or other suitablecement, attaching the stone firmly to the spindle. The spindle 0 passesonly part-way through the eye of the stone. In the top end a femalesrew-thread is out.

crepresents the supplemental end of the spindle O, which is attached tospindle G by a screw-bolt, as shown in Fig. 3. The removable portion cisused as a feed-saucer. It is made removable so that it can be taken offout of the way to allow thense of a diamond dresser.

d represents a metallic plate or lining, coverin g the plastic-filledeye of the stone and extending from the spindle to a point near theinner end of the furrows. The inner periphcry of the stone is beveledoff to allow disk at to be seated in a plane slightly below the bottomof the furrows. This disk furnishes a smooth continuous surface for thegrain to fall upon from the feed-saucer or spindle end, and secures aneven distribution of the material to the several encircling furrows. Itis-readily removable, so that it will not be injured in dressingthe'stone, and to allow the eye of the stone to be dressed down, so thatdisk d can be kept in the same relative plane.

G represents the upper stone, securely set within a ring, 9.

g represents an outer concentric ring; F, an upper hinged curb; f,pivots which pass through lugs on the top of curb F. The points pressagainst the outer ring, g, and suspend the same.

F represents bolts passing. through ring 9 and gimbaling the upperstone, G, ontheir points, these two sets of gimbaling-pivots, f and F,being placed in axial planes at right angles to each other, form auniversal joint, which secures the automatic tramming of the upper stoneto the lower stone. 1 represents a ring, inwhich tram-pot I is suspendedby means of the pivots i i. Ring I is in turn suspended'on pivots t" 2",set at right angles with the plane of pivots t i, and these two sets ofpivots, in connection with the ring I, tram-pot I, and bridge-tree B,form a universal self-adjusting tram-pot, allowing the spindle O to runon its step free from binding and with but a small amount of friction.The upper journal-bearing is formed in like manner of two concentricrings, K L, secured and gimbaled on the frame by means of lugs l andpivots K and Z, which form a universal selfadj ustin g upper bearing forthe mill-spindle.

H represents spider-arms. Three or more should be employed having attheir common centers a circular aperture through which passes thefeed-spout.

H H represent posts projecting from the top of curb F, for supportingspider-arms H.

h represents one of the posts having screwthreads engaging in a femalescrew in one end of arm H, acting as a post and adapted to raise andlower hopper M, suspended thereby.

U u a represent another set of spiderarms, with feet w, and v aset-screw, for raising and 0 a set-screw suspending rod B.

lowering the tube m, suspended in the hub of spider U, through thecenter of which the feedtube m passes. By adjusting the screw 12 thefeed-spout m can be adjusted to or from the feed spindle or saucer 0,and the feed or supply of grain from the hopper M regulated with greatnicety.

0 represents a scale-beam, suspended on post N by knife-edged pins.

0 represents a forked end, grasping or engaging with screw-washer 0 onthe rod B, which suspends bridge-tree B.

0 represents a weight, which can be set to counterbalance the weight ofthe stone suspended on the bridge-tree to obtain the grind ing-pressureon the stones.

P represents a tripping-rod, which is suspended on trunnions n, turningin journals on post N.

n represents a cam on the short shaft between trunnions n.

7 represents a cam-lever projecting up from scale-beam 0. The turning ofthe trippingrod 1? over to a horizontal position, as shown in Fig. 2,carries cam n against cam-lever r, and elevates the weight 0, loweringbridge- "tree B, and separating the stones by removing thegrinding-pressure from the bridge-tree.

P is a weight on tripping-rod P, and is adj usted so as to overbalanceweight 0 and elevate the scale-beam 0.

R represents a balance-lever, pivoted to hopper M by pivot r.

S represents a plate on the end of lever It, which is made of such shapeas to lie against the side of the hopper M when the rod R is in ahorizontal position. (Shown in Fig. 1.)

T represents a hook on the end of rod 1?, bent to engage over the leverB and act as a catch. Float or plate S is held down by the material inhopper M, resting upon the same. When the material in the hopper hasbeen ground float S rises, the outer end of lever R falls, releasing theweighted tripping-rod P, which turns over horizontally, overbalancingweight 0, and automatically removing the grinding-pressure from therunning-stone the instant the grist or charge in the hopper is ground.

'Instead of arranging the float S on the inside of the hopper, a holemay be cut in the hopper and covered by a flexible diaphragm of leatheror similar material, and the pressureplate be made to press up againstthe diaphragm on the outside, the lever being pivoted under the hopper,so as to allow the weighted end to drop and to throw the tripping deviceas the grain leaves thehopper.

Fig. 6 represents the tripping devices applied to an upper-run mill.

R represents the weighted lever, and S the pressure-plate in the hopper;R, the trippingrod; Q, a cam on the end of rod R; R, a liftin g-lever,hinged at p to the frame of the mill;

When trip- IIO ping-rod R" turns over to a horizontal position (shown bydotted lines) cam Q, raises lever 3', rod B, bridge-tree B, and stone S,causing it to run clear of the face of the lower stone.

The concentric rings 0 O and the disk and hub may be cast in one piecewith the circular pockets cored or cast in the periphery, and stillembody the features shown in the drawings. So, also,instead ofsuspending the rings on the points of pivots the several pivots may beused as trunnions to journal the rin gs upon the points, instead ofgimbaling the parts on, and still accomplish the objects stated above asfeatures of my invention.

What I claimis- 1. The combination of the millstone and the annular ringin which it is arranged with an outer'concentric ring arranged to createan annular space between the two rings for receiving weights, andpartitions 0, arranged in said annular space to prevent the weights fromshifting during the rotation of the stone, substantially as and for thepurposes described.

2. In a grinding-mill, the combination, with the spindle, of thetrain-pot I, the ring I, the pivots i i, supporting the tram-pot, thepivots t i, on which the ring is suspended, and the bridge-tree havingbearings supporting the pivots of the said ring, substantially as andfor the purpose described.

3. In a millstone-bush, the combination of the journal-bearing L, thering K, the adjustable pivots K K, supported by the ring, and on whichthe journal-bearin g is suspended, the lugs l, and the pivots l, passingthrough the V lugs and sustaining the said rin g, substantially as andfor the purpose described. I

4. In a two-part millstone-spindle, the combination, with the lowerspindle, of the part c, constitutin g a feed-saucer, and (letachablyconnected with the upper end of the lower spindle at a point below theface and within the body of the lower running-stone, substantially asand for the purpose described. V

5. A balanced pivoted pressure-plate and lever arranged upon the hopper,with the float or plate portion adapted to be held down or kept fromrising by the weight of the material or charge in the hopper, incombination with the swinging bridge-tree and devices adapted byconnection with the pressure-plate lever to raise the bridge, and toadmit, after their disconnection from said lever, of the shifting of thebridge, so as to remove the grinding-pressure from the millstone,substantially as herein set forth.

6. In combination with the pivoted lever B. and float S, thetripping-rod P, scale-beam O, swinging bridge-tree B, and rod B,substantially as herein set forth.

7. The pressure-plate S and lever R, in combination with trippingdevices arranged to antomatically remove the grinding-pressure from themillstone, as the charge or grist leaves the hopper, by shifting thebridge and the running-stonc, substantially as herein set forth.

8. The combination, with the lower runningstone,D,the upper stationarystone,G,the outer surrounding curb,F, the hopper and the doublefeed-tube composed of the outer tube, m, and the inner tube, m, of thevertically-adjustable spider U, connected with the outer tube andsupported directly on the upper surface of the stationary stone, and thevertically-adjustable spider H, connected with the inner tube andsupported by the curb, said members being arranged, substantiallyasdescribed, for adjusting both parts of the double feed-tube, for thepurposes set forth.

9. The combination, with thelower running and upper stationary stones,the surrounding curb, the hopper, and the double feed-tube,

, composed of the outer and innermovable tubes,

